Basil Rathbone

Sherlock Holmes

Nigel Bruce

Dr. John H. Watson

Gale Sondergaard

Adrea Spedding

Dennis Hoey

Insp. Lestrade

Vernon Downing

Norman Locke

Alec Craig

Radlik

Arthur Hohl

Adam Gilflower

Mary Gordon

Mrs. Hudson

Teddy Infuhr

Larry (uncredited)

Donald Stuart

Artie - Shooting Gallery Attendant (uncredited)

Harry Cording

Fred Garvin (uncredited)

Belle Mitchell

Fortune Teller (uncredited)

Angelo Rossitto

Obongo - Pygmy (uncredited)

Sylvia Andrew

Charwoman (uncredited)

Marie De Becker

Charwoman (uncredited)

Jimmy Aubrey

News Vendor (uncredited)

Brandon Beach

Carnival Patron (uncredited)

Frank Benson

Toy Doll Attendant (uncredited)

Lydia Bilbrook

Susan (uncredited)

John Burton

Radio Announcer (uncredited)

James Carlisle

Casino Patron (uncredited)

Jack Deery

Casino Patron (uncredited)

George Kirby

News Vendor (uncredited)

Stanley Logan

Robert (uncredited)

Wilbur Mack

Casino Patron (uncredited)

Edmund Mortimer

Casino Patron (uncredited)

William H. O'Brien

Doorman (uncredited)

John Roche

Casino Croupier (uncredited)

Gene Roth

Henchman Taylor (uncredited)

Arthur Stenning

Plainclothesman (uncredited)

Florence Wix

Casino Patron (uncredited)

Herschel Graham

Casino Patron (uncredited)

Ethelreda Leopold

Casino Patron (uncredited)